i've issues while using ajax in form submission

i am creating a blog application
i've some issues while using ajax in forms

Warning (2): array_merge() [function.array-merge]: Argument #2 is not
an array [CORE\cake\libs\view\helpers\form.php, line 175]

Notice (8): Undefined index: type [CORE\cake\libs\view\helpers
\form.php, line 204]

Notice (8): Undefined index: type [CORE\cake\libs\view\helpers
\form.php, line 221]

Notice (8): Undefined index: default [CORE\cake\libs\view\helpers
\form.php, line 226]

please help me to resolve this issue

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